2006-11-11 17:16:35 +00:00
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.\" Copyright (c) 2006 Joseph Koshy. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" This software is provided by Joseph Koshy ``as is'' and
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.\" any express or implied warranties, including, but not limited to, the
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.\" implied warranties of merchantability and fitness for a particular purpose
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.\" are disclaimed. in no event shall Joseph Koshy be liable
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.\" for any direct, indirect, incidental, special, exemplary, or consequential
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.\" damages (including, but not limited to, procurement of substitute goods
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.\" or services; loss of use, data, or profits; or business interruption)
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.\" however caused and on any theory of liability, whether in contract, strict
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.\" liability, or tort (including negligence or otherwise) arising in any way
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.\" out of the use of this software, even if advised of the possibility of
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.\" such damage.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd August 29, 2006
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.Os
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2006-11-13 09:46:16 +00:00
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.Dt GELF_GETSYM 3
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2006-11-11 17:16:35 +00:00
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.Sh NAME
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.Nm gelf_getsym ,
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.Nm gelf_update_sym
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.Nd read and update symbol information
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.Sh LIBRARY
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.Lb libelf
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.Sh SYNOPSIS
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.In gelf.h
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.Ft "GElf_Sym *"
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.Fn gelf_getsym "Elf_Data *data" "int ndx" "GElf_Sym *sym"
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.Ft int
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.Fn gelf_update_sym "Elf_Data *data" "int ndx" "GElf_Sym *sym"
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.Sh DESCRIPTION
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These convenience functions are used to retrieve and update class-dependent
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.Vt Elf32_Sym
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and
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.Vt Elf64_Sym
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structures in an ELF object.
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.Pp
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Argument
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.Ar data
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is an
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.Vt Elf_Data
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descriptor associated with a section of type
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.Dv SHT_SYMTAB ,
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.Dv SHT_DYNSYM
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or
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.Dv SHT_GNU_versym .
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Argument
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.Ar ndx
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is the index of the symbol being retrieved or updated.
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The class-independent
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.Vt GElf_Sym
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structure is described in
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.Xr gelf 3 .
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.Pp
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Function
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.Fn gelf_getsym
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retrieves class-dependent symbol information at index
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.Ar ndx
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in data buffer
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.Ar data
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and copies it to the destination pointed to by argument
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.Ar sym
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after translation to class-independent form.
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.Pp
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Function
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.Fn gelf_update_sym
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converts the class-independent symbol information pointed to
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by argument
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.Ar sym
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to class-dependent form, and writes it to the symbol entry at index
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.Ar ndx
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in the data buffer described by argument
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.Ar data .
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Function
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.Fn gelf_update_sym
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signals an error if any of the values in the class-independent
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representation exceeds the representable limits of the target
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type.
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.Sh RETURN VALUES
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Function
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.Fn gelf_getsym
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returns the value of argument
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.Ar sym
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if successful, or NULL in case of an error.
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Function
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.Fn gelf_update_sym
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returns a non-zero value if successful, or zero in case of an error.
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.Sh ERRORS
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These functions may fail with the following errors:
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.Bl -tag -width "[ELF_E_RESOURCE]"
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.It Bq Er ELF_E_ARGUMENT
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Arguments
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.Ar data
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or
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.Ar sym
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were NULL.
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.It Bq Er ELF_E_ARGUMENT
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Argument
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.Ar ndx
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was less than zero or larger than the number of symbols in the data
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descriptor.
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.It Bq Er ELF_E_ARGUMENT
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Data descriptor
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.Ar data
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was not associated with a section containing symbol information.
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.It Bq Er ELF_E_RANGE
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A value was not representable in the target type.
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.El
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.Sh SEE ALSO
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.Xr elf 3 ,
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.Xr elf_getdata 3 ,
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.Xr elf_getscn 3 ,
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.Xr gelf 3 ,
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.Xr gelf_getsyminfo 3 ,
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.Xr gelf_update_syminfo 3
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